diastole

di·as·to·le

noun \dī-ˈas-tə-(ˌ)lē\

Definition of DIASTOLE

1

: the passive rhythmical expansion or dilation of the cavities of the heart during which they fill with blood—compare systole

2

: the rhythmical expansion of a pulsating vacuole (as of an ameba)

—di·a·stol·ic \ˌdī-ə-ˈstäl-ik\ adjective